/*
* ProjectilesMove; called for every frame.
* dt is number of milliseconds since last time animation timer went off.
* Return True iff some projectile moved.
*/
Bool ProjectilesMove(int dt)
{
list_type l, next;
if (current_room.projectiles == NULL)
return False;
// Have to be careful here, since deleting items from list as we go down it
l = current_room.projectiles;
while (l != NULL)
{
Projectile *p = (Projectile *) (l->data);
next = l->next;
if (MoveSingle(&p->motion, dt))
{
current_room.projectiles = list_delete_item(current_room.projectiles, p,
CompareProjectiles);
SafeFree(p);
}
else if (p->flags & PROJ_FLAG_FOLLOWGROUND)
{
p->motion.z = GetPointFloor(p->motion.x, p->motion.y);
}
l = next;
}
return True;
}
/*
* MoveTooCloseToWall: User is moving from (old_x, old_y) to (new_x, new_y).
* Return True if this moves user too close to an impassable wall.
*/
Bool MoveTooCloseToWall(BSPTree tree, int old_x, int old_y, int new_x, int new_y,
int min_distance)
{
int i, last_x, last_y, x, y, z;
// Divide move into a few pieces to prevent a move that jumps clear through
// a wall, but where either endpoint isn't too close to a wall
last_x = old_x;
last_y = old_y;
for (i=1; i <= STEPS_PER_MOVE; i++)
{
// Find height of floor at object's current location
z = GetPointFloor(tree, last_x, last_y);
x = old_x + (new_x - old_x) * i / STEPS_PER_MOVE;
y = old_y + (new_y - old_y) * i / STEPS_PER_MOVE;
if (MoveCheckBSPNode(tree, last_x, last_y, x, y, z, min_distance) == True)
return True;
last_x = x;
last_y = y;
}
return False;
}
/*
* D3DParticleIsAlive: Decrements particle energy, checks if particle
* is alive and can be displayed. Doesn't check if
* particle is behind the player, because position
* and velocity still need to be updated for these.
*/
Bool D3DParticleIsAlive(emitter *pEmitter, particle *pParticle)
{
if (pParticle->energy == 0)
return false;
if (--pParticle->energy <= 0)
{
pParticle->energy = 0;
pEmitter->numAlive--;
return false;
}
if (pEmitter->emitterFlags & PS_WEATHER_EFFECT)
{
PDIB pdibCeiling = NULL;
pdibCeiling = GetPointCeilingTexture(pParticle->pos.x, pParticle->pos.y);
if (pdibCeiling)
{
pParticle->energy = 0;
pEmitter->numAlive--;
return false;
}
}
// If we don't allow this type of particle to survive inside the ground, destroy it.
if ((pEmitter->emitterFlags & PS_GROUND_DESTROY)
&& (pParticle->pos.z < GetPointFloor(pParticle->pos.x, pParticle->pos.y)))
{
//debug(("destroying particle, floor: %i, pHeight: %6.1f \n",
// GetPointFloor(pParticle->pos.x, pParticle->pos.y), pParticle->pos.z));
pParticle->energy = 0;
pEmitter->numAlive--;
return false;
}
return true;
}
